Round to Add
Round to the nearest 10. Then add to find the sum.
135+152
140+150=290
Round to nearest 10, then find difference.
856-328
860-330=530
Add.
123+452
100+400=500
20+50=70
3+2=5
575
Subtract.
416-243
416-200=216
216-40=176
176-3=173
How many planets are in our solar system?
8. If you counted Pluto as a dwarf planet that would make it 9.
Round to the nearest hundred. Then Add to find the sum.
535 + 423
500+400=900
Round to nearest 100, then find difference.
526-207
500-200=300
Add.
412+273
400+200=600
10+70=80
2+3=5
685
Subtract.
856-243
856-200=656
656-40=616
616-3=613
Which planet is closest to the sun?
Mercury
Round to nearest 10 then find the sum.
236 + 217
240+220= 460
Round to nearest 10, then find difference.
863-526
860-530=330
Add.
412+273+139
400+200+100=700
10+70+30=110
2+3+9=14
824
Subtract.
220-180
220-180=40
Make sure students show work.
What needs to be broken before you can use it?
Round to nearest 100, then find sum.
407+326
400+300=700
748-229
700-200=500
Add.
124+32+238
100+200+0=300
20+30+30=80
4+2+8=14
384
Solve in any way you choose.
657-122
657-122=535
What is the largest planet in our solar system?
Jupiter
Estimate.
196+243
200+240=440
200+200=400
Estimate.
489-253
500-300=200
490-250=240
125+221+302+443
100+200+300+200=800
20+20+0+40=80
5+1+2+3=11
891
Solve in any way you choose.
400-225
400-225=175
What is the tallest mountain in the world?
Mt. Everest located in the Himalayas on the border of Nepal and China.